tests/test_ropes_buffer_to_s.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Checks the immutability of the strings returned by `RopeBuffer.to_s`.
  16 module test_ropes_buffer_to_s
  17
  18 import standard
  19
  20 # Note: In this sort of test, never print the string more than once: the string
  21 # itself may cache an flatten representation of itself when `print` calls `to_s`
  22 # on it. For example, the original bug that motivated the writting of the
  23 # present test got unoticed until we tried to edit the buffer **before**
  24 # outputting `s`.
  25
  26 var buffer = new RopeBuffer
  27 var s: String
  28
  29 sys.stdout.write "`clear` and `append`: "
  30 buffer.append "abcd"
  31 s = buffer.to_s
  32 buffer.clear
  33 buffer.append "ef"
  34 print s
  35
  36 sys.stdout.write "`clear` and `add`: "
  37 buffer.clear
  38 buffer.add 'a'
  39 buffer.add 'b'
  40 s = buffer.to_s
  41 buffer.clear
  42 buffer.add 'c'
  43 print s
  44
  45 sys.stdout.write "`add` at `maxlen + 1`: "
  46 buffer.clear
  47 buffer.add 'c'
  48 s = buffer.to_s
  49 buffer.append("*" * (maxlen -1))
  50 buffer.add 'x'
  51 print s
  52
  53 sys.stdout.write "`append` up to `maxlen + 1`: "
  54 buffer.clear
  55 buffer.append "ab"
  56 s = buffer.to_s
  57 buffer.append("*" * (maxlen -1))
  58 print s
  59
  60 sys.stdout.write "`reverse`: "
  61 buffer.clear
  62 buffer.append "xyz"
  63 s = buffer.to_s
  64 buffer.reverse
  65 print s
  66
  67 sys.stdout.write "`upper`: "
  68 buffer.clear
  69 buffer.append "foo"
  70 s = buffer.to_s
  71 buffer.upper
  72 print s
  73
  74 sys.stdout.write "`lower`: "
  75 buffer.clear
  76 buffer.append "BAR"
  77 s = buffer.to_s
  78 buffer.lower
  79 print s